subsurface geology and coal resources of the pennsylvanian system ...

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92 ILLINOIS BASIN COAL RESOURCES graphic level. In some drill holes many feet of igneous rock have been peneti-ated (fig. 18). It has not been demonstrated that the Omaha uplift was caused by the arching effect od igneous intrusion in the form of a thick sill or laccolith, although deeper drilling may prove this to be the case. The relatively shallow occurrences appear to be dikes rather than sills. It seems probable that such dikes are not restricted to the area of the uplift, but have been reported there mainly because of the more closely spaced drilling, and because of the alertness of company geologists in correctly interpreting the character of drill cuttings early in the exploration of the Omaha structure. Although dikes are relatively common in Saline County, examination of many drillers' records, both cable-tool and diamond-drill, reveals few that record igneous rock. It is doubtful that Illinois drillers, who are usually unfamiliar with this type of lithology, would recognize and report i~neous rocks. In the Omaha dome area igneous rocks occur at various stratigraphic levels. They are found as deep as 1800 feet where they occur in Chester beds, and as close to the surface as 250 feet in Pennsylvanian beds. The thickness penetrated ranges from a few to 50 or 60 feet (fig. IS). Contact metamorphism of a mild character, sufficient to coke an adjacent coal bed for several feet on either side, but with only very mild alteration on adjacent sedimentary rock, has been observed in mines in Saline C~unty.'~ Similar mild contact metamorphism probably attended intrusion in the Omaha dome. The igneous bodies are represented in electric logs by as much as 400 ohm-meters on the sesistivity curves, whereas the potential curve is usually either a straight line Gr sho,~vs a slight positive potential. A more complete description of the igneous rock of the Omaha dome is given by English and G~ogan.~' 2i Ref. 23. 2s English, R. M.. and Grogan, R. M., The Omaha pool and mica-peridotite intrusives. Gnllntin County, Illinois: Structure of typical American. oil fields. vol. 111, A.A.P.G., pp. 189-212. April 1948; Illino~s Geol. Survey Rept. Inv. 130, Allgust 1948. GOAL RESOURCES Coal resources in the No. 5 and No. 6 coal beds in Gallatin County north of the Shawneeto~vn fault have been estimated at 1971 million tons (1919). This estimate was based on an average thickness of 4 feet for each coal bed, 225 square miles underlain by No. 5 and 210 square miles underlain by No. 6.2The calculations were made on the basis of 1,132,800 tons per square-mile-foot (1770 tons per acre footsp. gr. 1.30). Present studies require some revision of the estimate. The accompanying map indicates about 221 square miles underlain by No. 6 coal bed and about 232 square miles by No. 5, giving a total of 1000 million tons o,f No. 6 and 1053 million tons of No. 5 or a total of 2053 million tons, assuming an average thickness of 4 feet for each bed. More recently (1944) the amount of coal in No. 5 and NO. 6 beds north of the §hawneetown fault was estimated as approximately 2000 million tons and the resources present in the Davis and Dekoven beds as about 1000 million tons.30 The present studies have thrown additional light on distribution and thickness of the Davis and Dekoven beds in Gallatin County. The Davis bed underlies approximately 250 square miles of the county and represents about 990 million tons of coal with an average thickness of 3.5 feet. The combined thickness of the two beds is in the order of 6s feet (p. 78), but the Davis bed appears to be the only one that maintains a thickness averaging more than 3 feet. Thus the estimated total amount of coal in the No. 6, No. 5, and Davis beds is in the order of 3000 million tons. Of this quantity less than 1 percent has been mined or rendered unrecoverable by mining mocesses. However, structural irregularities are probably sufficiently important along the fp-ult lines to prevent the recovery of 2Tady, G. H.. Coal resources of District V (Saline and Gallatin counties) : Illinois Geol. Survey Min. Inv. Bull. 19. table 15. p. 106, 1919. 30 Cady, G. H.. Coal resources based on information obtained from rotary drilling: Illinois Geol. Survey Rept. Inv. 93, pp. 37-38. 1944.
GA LLA TIN EXCHANGE OIL COMPANY GALLATIN COUNTY NO 161 OPAL EVANS N 0. I SEC.20,T.8S ,R 8 E. SELF-POTENTIAL RESISTIVITY SE LF-POTENTIAL RESlSTlV ITY MILLIVOLTS FIG. 18.-Graphic log of Exchange Oil Co., Opal Evans No. 1, Gallatin County, showing igneous bodies as broken vertical lines.
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SUBSURFACE GEOLOGY AND COAL RESOURC
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ORGANIZATION STATE OF ILLINOIS HON.
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CONTENTS INTRODUCTION BY GILBERT H
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PAGE Structure of Herrin (No. 6) co
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SUBSURFACE GEOLOGY AND COAL RESOURC
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oi the strata below the lower bench
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INTRODUCTION 13 less than 1000 feet
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INTRODUCTION 15 Grateful acknowledg
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INTRODUCTION TABLE 2.-CONTROL DRILL
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INTRODUCTION i I County Sec. T. R.
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Cumberland County 585 725 731 1130
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Jasper County Siltstone 11 ; black
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Sangamon County Wabash County 467 "
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28 ILLINOIS BASIN COAL RESO UKCES t
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30 ILLINOIS BASIN COAL RESOURCES 1
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32 ILLINOIS BASIAT COAL RESOURCES t
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34 ILLINOIS BASIN C09L RESOURCES la
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36 ILLINOIS BASIN COAL RESOURCES gr
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3 5 ILLINOIS BASIN COAL RESOURCES 1
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40 ILLINOIS BASIN COAL RESOURCES be
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Page 50 and 51: ILLINOIS BASIN COAL RESOURCES TABLE
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Page 58 and 59: TABLE 6.-INTERVALS BETWEEN TOP OF N
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Page 98 and 99: SUBSURFACE GEOLOGY OF HAMILTON COUN
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Page 120 and 121: GULF REFINIXG COMPA:
Page 122 and 123: ILLINOIS BASIN COAL RESOURCES Count
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Page 126 and 127: __!L APPENDIX OF TABULATED DATA Abb
Page 128 and 129: Total depth: The total depth of the
Page 130 and 131: , -- .- -- ----- - -- I---]=- Locat
Page 132 and 133: Location of Hole I Twp. 1 Range / S
Page 134 and 135: Location of Hole TABULATED DATA ON
Page 136 and 137: t TABULATED DATA ON KEY BEDS CLAY C
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Page 142 and 143: Location of Hole I County Number --
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Location of Hole I Twp. 1 Range Sec
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- -- -- - -- *- - -- -- - -. Locati
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Location of Hole TABULATED DATA ON
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Location of Hole I Twp. Range 1 Sec
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Location of Hole County Number TABU
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TABULATED DATA ON KEY BEDS CLAY COU
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TW~. I Location of Hole -- Range SI
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Location of Hole County Number TY p
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Location of Hole I== TABULATED DATA
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Twp. 1 iiange 1 Sec. TABULATED DATA
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Twp. -- 1N 1N 1N Location of Hole R
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-- TABULATED DATA ON KEY BEDS Locat
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TABULATED DATA ON KEY BEDS EDWARDS
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Location of Hole Twp. Range Sec. Nu
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TABULATED DATA ON KEY BEDS EDWARDS
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Location of Hole I I Twp. Range Sec
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' Location of Hole Twp. Range Sec.
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Location I of I Hole - - -- Twp. Ra
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PENNSYLVANIAN SYSTEM IN ILLINOIS BA
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-- TABULATED DATA ON KEY BEDS -- GA
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TABULATED DATA ON KEY BEDS GALLATIN
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TABULATED DATA ON KEY BEDS I GALLAT
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Location of Hole I L p . Range iec.
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- Twp. Location o Hole Rang< Sec. /
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Location of Hole 1 1 1 Twp. Range S
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-- Location of Hole I F Twp. I Rang
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Twp. Location of Hole I Range Sec.
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TABULATED DATA ON KEY BEDS Location
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Twp. 3 8 Location of Hole TABULATED
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Twp. I TABULATED DATA ON KEY BEDS 0
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TABULATED DATA ON KEY BEDS 10 HAMIL
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Location of Hole I Twp. 1 Range 1 S
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TABULATED DATA ON KEY BEDS HAMILTON
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SYLVANlAM SYSBE A. - - 'aw ek m~c r
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TABULATED DATA ON KEY BEDS HAMILTON
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p-p-ppppp - -- Location of Hole I r
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Location of Hole Twp. Range Sec. TA
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--- -- -- -- - Location of Hole . -
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IAN SYSTEM IN ILLINOiS BASIN
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PENNSYLVANIAN SYSTEM IN lLLlNOlS BA
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I- PENNSYLVANIAN SYSTEM IN ILLINOIS
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1 TIP. Range Sec. . -.-- -- TABULAT
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-f- T I Q Be Q ~n rm O\ - 3 ~ o m+
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NSYLVANIAN SYSTEM IN ILLINOIS BASIN
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2N 2H 1 county TABULATED DATA ON KE
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TABULATED DATA ON KEY BEDS RICHLAND
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Location of Hole Twp. Range Sec. TY
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PENNSYLVANIAN SYSTEM IN ILLlNOlS BA
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Location of Hole - TABULATED DATA O
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'n, (U - ;I Y .- I- L - (U -0 - 2:
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TABULATED DATA ON KEY BEDS Location
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SYSTEM IN /LLINOIS BAS/ - ma now- e
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- - Location I I of Hole TXP. Range
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-. - - --- - - - -- County Number T
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RICHLAND COUNTY 0 9 ot- OV) urn - -
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TABULATED Location of Hole 1 Type I
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